Abstract
Bismuth oxychloride (BiOCl) nanoflowers and bismuth oxychloride/reduced graphene oxide (BiOCl/rGO) composites with different weight percentage were prepared by solvothermal method. BiOCl/rGO hybrids electrode based symmetric solid state supercapacitor was fabricated by sandwiching alkaline polyvinyl alcohol (PVA/KOH) gel electrolyte in presence and absence of potassium iodide (KI). It delivered maximum specific capacitance of 611 F g−1 in presence of PVA/KOH+KI gel electrolytes, increasing by 8.75% compared to the PVA/KOH based supercapacitor. The energy and power density of the supercapacitor in presence of PVA/KOH+KI were reached 21.21 Wh kg−1 and 1.37 kW kg−1 respectively. The supercapacitor exhibits 90% capacitance retention even after 10 000 cycles.
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